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"Carborundum" is actually the initial trade name that SiC was originally patented (think Kleenex vs tissue). The Carborundum company now resides with Saint Gobain. They still make abrasives but other parts of the company make specialized parts for heat exchangers, furnaces, etc.

I believe my father had used a 4 sided 'stone' which looked identical to the one in the original post with the green handle--though his was significantly dished--is that only antique or are they still available today?